Hello,
Let me get it right, you say that these .exe files are created after you have Removed the USB drive and till the drive was in the Drive. It was not creating the .exe files correct?
1) Is this USB a External Drive or a USB meant for Internet Purposes?
2) Could you let us know the path where the .exe files are getting created? Could you also attach a screenshot?
3) Symantec is detecting it as which Threat?
Awaiting Reply.